Well, this is probably not the right person, because she is in Minneapolis in 1910: "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2G4-NXP : 29 October 2015), Ellen M Hjelmerus in household of David J Hjelmerus, Minneapolis Ward 5, Hennepin, Minnesota, United States; citing enumeration district (ED) ED 97, sheet 5B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,715.
But this Elin Barbro Maria, born 9 Jun 1880 in Edsbyn, Ovanåker is what came up in a search in Folkräkningar at SVAR. I did a search for Barb* El* in the span 1865-1880. There was ONE other Elin Barbara, but she remained in Sweden, while miss Hjelmerus emigrated with her parents around 1887.
Folkräkningar isn't much help if your Barbara Ellen was born in the USA by parents who emigrated before 1880, which is the first fully covered year.